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Varietal variation in uptake and utilization of potassium (rubidium) in high‐salt seedlings of barley
Author(s) -
JENSÉN PAUL,
PETTERSSON SUNE
Publication year - 1980
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1980.tb03277.x
Subject(s) - rubidium , hordeum vulgare , potassium , shoot , nutrient , chemistry , transpiration , salt (chemistry) , hordeum , agronomy , horticulture , botany , biology , poaceae , photosynthesis , organic chemistry
Seedlings of eleven varieties of barley ( Hordeum vulgare L.) showed differences in utilization of K + from a full nutrient solution containing 3.0 m M K + . The K + content of both roots and shoots was proportional to the fresh weights and dry weights after a week in the nutrient solution. The K + use‐efficiency ratio, which indicates the efficiency of nutrient utilization (mg dry weight produced per mg K + absorbed), differed significantly among the varieties. There was no correlation between influx of Rb + and the content of K + . It is suggested that there are wide varietal differences in such genetically‐determined properties as ion influx and efflux and net ion transport to the shoot. Further‐more, the influx of Rb + was closely linked to transpiration, probably due to a variety‐specific non‐metabolic part of Rb + influx. Varietal differences in influx of Rb + were more pronounced in high‐K + roots than in low‐K + roots with maximum rate of Rb + uptake, but the rank of varieties was the same in each case. – Criteria for the selection of K + use‐efficient varieties of barley are discussed.